Slate-shaving machine



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R. A. COFFIN.

SLATE SHAVI'NG MACHINE.

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R. A.' COIFIN.

Y SLATE SHAVING MACHINE. Y Y No. 315,247. Patented Apr. 7, 1885.

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NV VEJV TOR lttornay llilrirTED STATES PATENT l ,'OFEICE.

ROBERT A. coEEIN, oE sLATINGToN, PENNSYLVANIA.

sLATE-SHAVING MACHINE.-

SPECIFICATION forming p art of Letters Patent No. 315,244?, dated April7, 1885. Application filed June 16,'1'881. (No model.)

To all whom, t may concern: y,

. Be it known that I, ROBERT A. COFEIN, of Slatington, in the county ofLehigh and State of Pennsylvania, have invented new and usefullmprovements in Machines for Shaving Slates or other Material; and I dohereby declare the following to be a full, clear, and exf actdescription ot' the same, reference being had to the accompanyingdrawings, and to the letters of reference marked thereon,in whichuFigure l represents a perspective view of the machine. Fig. 2 is avertical longitudinal section of the same. Fig. 3is avertical section onthe line w :c of Fig. 2 Fig. `4 is a detail view ofthe double-threadedsleeve. Fig. 5 is a cross-section of the slide-frame and of the rack barand pins thereon. Fig. 6 is a plan view of the complete machine. Fig. 7is a central vertical section of the same, on theline y y, Fig. 6; andFig. 8 is a front view of the rod Q and its attachments.

This invention relates to improvementsin machines for shaving orreducing the thickness of slabs or plates of slate or other material;and it consists in the construction and novel arrangement of partshereinafter fully described, and pointed out Ain the appended claims. i

In the accompanying drawings, A represents the horizontal bed-frame ofthe machine, supported on the legs a a, which are connected near theirlower ends by the longitudinal beams a a', up'on which two oftheactuatingshafts of the machine have their bearings, as shown.

A A are opposite standards rising from the center of the side beams ofthe bed-frame.

B B are transverse rollers, of rubber or other suitable yieldingmaterial, the shafts of which turn in bearings b b, secured to thestandards A', as shown.

. C is a transverse shaving or grinding roller, made of iron, corundum,emery, or other suitable material, and situated between the rollers B B.The shaft of said roller has bearings c, secured to the standards A, andis given a lateral reciprocating motion by means of mechanism,.hereinafter described, which connects with one of its ends extendedoutward from its bearing.

D D are horizontal ways supported on uprights rising from the bed-frameA, and runiof the' slide-frame.

ning from one end of. the said frame inward ,to within a short distanceof the meeting line `of the shaving-roller VC and the upper roller, B,iso that the slide E may drive before it on said lways a slab or plateof slate,and make the same pass between the said rollers.V

D D are ways silnilar to the ways D, but running from the opposite endofthe bedframeinward to within'a short distance of the meeting line ofthe shaving-roller and the lower roller. B and -E is a slide moving andacting thereon similarly to theslide E on the ways D.

F is a rack-bar pivoted at its, inner end to a bracket, f, Xed to theouter edge of the slide E, and having on its outer end theinwardlyextending pin X and the outwardly-extending pin X. The rack ison the under edge of the bar F, and is moved inwardly by a pinion, g, ona transverse shaft, G, which has ,bearings iXed to uprights rising fromthe'bedframe A.

F is a rack-bar similar tothe bar F, and connected in alike manner tothe slide E', and g is a pinion actuating the same and `fixed to atransverse shaft, G, `having bearings on the bed-frame.

H is a cam-arm fixed in such a position on the shaft G that when thepinX comes above it, as the rack-bar moves inwardly, it is turned upunder said pin, disengaging the pinion g from the rack-bar E, andstopping the inward Imotionrof the said bar. A similar cam-arm, H', isfixed on the shaft G. 4

I is a slide-frame iXed to theside of the bed-frame in such positionthat when the rackbar F is moved inward the pin X rests upon theinwardly-extending gnide-ange 'i on its lower edge,andwhenthe rack-baris lifted by means of the cam-arm the said pin is raised on the inclinedguide-way j, which is formed by the upper edge of the inward extension JThe lower guideway for the pin X lies between the ange'z and the loweredge of the projection or eXtension'J.

u I is a slide-frame iixed to theother end of the bed-frame,constructedzlike the framel, and similarly engaging a pin, X,on the rackbar F.

K is a cord or rope xed by its inner end to the slide E, and havingsecured to its depending enda Weight, 7c, as shown. i

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L is a pulley with bearings in a standard rising from the outer end ofthe slide-frame I, and having the cord K passing over it.

K' is a similar cord connected with the slide E', passing over thepulley L', connected with the slide-frame I'.

M is a transverse shaft having bearings fixed to the lower edges of theside beams of the bed-frame vertically below the standards A'.

N is a sleeve feathered or splined on the extended end of said shaft,and having its exterior surface doubly threaded, the two threads beingin reverse direction and running into each other at their ends.

O is a vertical bar sliding in brackets fixed to the side of thebed-frame, and having laterally-extending arms o on its lower end,between which is a concaved edge which rests between the threads of thesleeve N,and makes the sleeve slip to and fro on the shaft M as itpasses from one thread to the other in the reverse direction.

P is a loose collar on the sleeve N, and P' is a similar collar on theshaft of the roller C. The

said collars may turn in annular grooves made onsaid sleeve and shaftnear their ends, or may fit over the reduced ends of the same,and bekept thereon by headed bolts.

Q is a rod having its ends made into semicircular forks the arms ofwhich are longitudinally slotted for the insertion of pins on thecollars P P', as shown.

q is a rod having its inner end secured to the foot of the standard A',and the rod Q pivoted to its outer end.

B is a transverse shaft having bearings on the beams c', and carryingthe driving-pulley r and a pulley, r', which, by means of a proper belt,drives the pulley r2 on the end of the roller G,opposite that to whichthe rod Q is connected. m is a pulley on the shaft M, which isrotated bya belt from the 'shaft It, (or a pulley thereon,) and, by means of itsrotation and the bar O', makes the sleeve N reciprocate on the shaft M.

S is a transverse shaft having bearings on the beams a', and rotatedfrom the shaftR by means of the pulley s and a proper belt.

T T' are pulleys, respectively on the opposite ends of the shafts G andG', which pulleys are rotated by means of belts from opposite ends ofthe shaft S or from pulleys thereon. The pulleys T T' are arranged toturn in opposite directions, so that the rack-barsF and F willsimultaneously approach and recede from the rollers; but this point isnot essential, and one rack-bar may be arranged to approach the rollersas the other recedes therefrom.

U is a slate passing between the upper roller, B, and the shavingrollerC.

The general manner of operating the niachine is as follows: The slate tobe operated on is placed in the ways D, in front of the slide E, and therack-bar F, actuated by the pinion g, moves inward till the pin X isover the camarm H, which has then turned sufficiently upward to lift therack-bar out of engagement with the pinion and leave the pin X' inposition to slip on the upper guideway, j. The rack-bar is then drawnoutward on said ways by the cord K and attached weight till the pin X'passes beyond the outer curved edge of the projection J, when therack-bar falls upon the flange z' and again engages the pinion g, tocarry another slate to the rollers.

The action of the mechanism at the other end of the frame is the same asthe above. The double-threaded sleeve, by means of the mechanismconnecting it with the shaft of the grinding or shaving roller C, causesthe latter to reciprocate laterally across the slate which is beingoperated upon when thelatter is passing between the rollers. The underside 0f the slate is shaved or reduced by the roller G and the upperroller, B, and after it hasbeen passed between the same itis passedbetween the rollers C and B', whereby its upper surfaceis shaved. Therollers B and B', being of rubber or similar material, give to differentthicknesses of slate.

Having described my invention, I claim- 1. I-n a slate-shaving machine,the combina- `tion, with a grinding or shaving roller having a lateralreciprocating motion in addition to its rotation', of two rollerssimilarin size,situ ated, respectively, above and below theshaving-roller and turning in opposite directions,

so that the slate may pass in one direction between the shaving-rollerand roller above it and in the reverse direction between theshaving-roller and roller below it, for the purpose of operatingalternately on the lower and up-v IOO per surfaces of the slate,substantially as specifr 2. In aslate-shaving machine, the combination,with the roller C, collars P P', rods Q q, threaded sleeve N, guide-barO, and shaft M, of the rollers B and B', rotating in oppositedirections,for the purpose of allowing the slate to pass between therollers C and B in one direction and between the rollers C and B in theopposite directions,substantiallyy as described.

3. Infaslate-shaving machine, the combination,with the rotating andlongitudinally-reciprocating roller G, and the rollersB B', rotating inopposite directions to each other,of the ways D D', slides E E', andrack-bars F F'. reciprocating, respectively, upon the ways D D',substantially as specified.

4. In a slate-shaving machine, the combination of thel roller B and therotating and longitudinally-reciprocating rollerG, with theways D, slideE, rack-bar F, provided with the pin x, pinion g, and cam-arm H,substantially as specified. i

In a slate-shaving machina, thecombina-v tion, with the ways D, slide E,rack-bar E, provided with the pins x and' ',.of the pinion g, cam-armII, slide-frame I, provided` with the ways if and j, cord- K, and weightk, sub# stantially as specified.

Witnesses: ROBERT A. COFFIN.

DAVID MCKENNA, GEORGE T. OPLINGER.

